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Did you know?
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The longest a person has survived after a heart transplant is 24 years.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Blood is approximately twice as thick as water because of the cells and other components found in it.